Basics of OVRDBF, OPNQRYF & Level check error in RPGLE
This video explains the basic concept of below topics,
1. Level ID and Level check error in RPGLE
2. Override Database File (OVRDBF)
3. OPNQRY file (Open Query file)
Learn more about OPNQRYF in below URL
https://www.ibm.com/support/knowledge...